@inbook{NBERc2773,
 Crossref = "NBERcrea56-1",
 title = "Appendix B: Estimates of Factor Inputs and Returns, 1900-1950",
 author = "Daniel  Creamer and Martin Bernstein",
 BookTitle = "Personal Income During Business Cycles",
 Publisher = "Greenwood Press",
 pages = "128-135",
 year = "1956",
 URL = "http://www.nber.org/chapters/c2773",
}
@book{NBERcrea56-1,
 title = "Personal Income During Business Cycles",
 author = "Daniel  Creamer and Martin Bernstein",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "Greenwood Press",
 year = "1956",
 URL = "http://www.nber.org/books/crea56-1",
}